195 (number)
From Wikipedia, the free encyclopedia
195 is the natural number following 194 and preceding 196.
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| Ordinal | One hundred [and] ninety-five |
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| Cardinal | 195th | ||
| Factorization |  |
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| Roman numeral | CXCV | ||
| Binary | 11000011 | ||
| Hexadecimal | C3 | ||
195 is a sphenic number, coming in the middle of the prime quadruplet 191, 193, 197 and 199. 195 is the sum of eleven consecutive primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37). Although not itself prime, 195 passes through Ulam's sieve and thus is a lucky number. The smallest number that can be expressed as a sum of distinct squares in 16 different ways is 195 (sequence A097563 in OEIS). 195 is a Harshad number.
